The non-marine Mollusca of the Greek island Lesbos ( = Mytilini) So far 25 species of land and freshwater molluscs have been reported from Lesbos; two of these do not really occur on the island. In the present paper 40 additional Recent species (total now 63) are mentioned; Carychium minimum and Chondrula werneri are new for Greece. Notes are given on some species, especially Enidae and Zonitidae. Lectotypes are designated for both Zonites (Zonites) lesbicus and Hyalina nitidissima var. samia.